The name is silly but the Galaxy XCover 6 pro checks all those boxes as a new phone. It even has the old style notification light, different colors for notifications.
Now that I've seen this... Most of the things people want out of a dumb phone can be accomplished by putting an android on ultra power saving mode. Except physical keyboards.
I want a “dumb” phone that can run signal. Just text, calls and signal. No camera, no other apps. It’s time we split the data honeypot back up in to smaller pieces.
This is why I want a Raspberry PI based PDA and a Tablet. Nothing fancy, even if its somewhat thick and not water proof, etc... It should be modular and repairable. Put a flavour of Linux on it and configure it to be secure. Then have a dumb phone which I can use as a modem if I want but otherwise call and text and turn off when I don't want it.
I would love to, but it seems they only work in very specific phones. And even then with questionable functionality. It kinda feels like trying to use Linux as a daily driver twenty years ago.
Definitely wouldn't want a dumbphone. Rather the opposite, like a super-smartphone, something like Raspberry Pi inside my pocket (PinePhone may be getting there).
This post got me to try installing Jellyfin server in Termux under proot, only to realize it's fairly useless for random videos and then wipe it 5 minutes later, but anyway that's the kind of things I do/want to do with my phone.
And hell, I'd definitely want a keyboard attachment like the PinePhone has.
Some of the other comments show that off pretty well. When people say they want a dumb phone they usually want a "dumb" phone that also has X, where X may be their favorite messaging app but it can also be anything else really, like a good camera or support for NFC payments.
+1 For the Light Phone. Owned both their Kickstarter edition and their latest generation, and makes travel, camping, and more easy when I forward my calls/texts. Great battery life with still some creature comforts we have all gotten used to, smart phone wise.